<?php

/*
 * 
 * 
 */
class Encryption_helper{
	var $this = null;
	
	public function __construct(){
        parent::__construct();
		
	}//endfct
	public function encrypt_key(){
		$skey = 'mlmeEncode2011';
		return $skey;
	}
	
	public  function safe_b64encode($string) {
 
        $data = base64_encode($string);
        $data = str_replace(array('+','/','='),array('-','_',''),$data);
        return $data;
    }
	public function safe_b64decode($string) {	
	
        $data = str_replace(array('-','_'),array('+','/'),$string);
        $mod4 = strlen($data) % 4;
        if ($mod4) {
            $data .= substr('====', $mod4);
        }
        return base64_decode($data);
    }
	 public  function encode($value){ 
	 
	// echo $this->$skey;exit;
	 //  $skey = 'SuPerEncKey2010';
		
	    if(!$value){return false;}
        $text = $value;
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
        $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256,Encryption_helper::encrypt_key(), $text, MCRYPT_MODE_ECB, $iv);
		return trim(Encryption_helper::safe_b64encode($crypttext)); 
    }
	
	 public function decode($value){
	   // $skey = 'SuPerEncKey2010';
		
        if(!$value){return false;}
        $crypttext = Encryption_helper::safe_b64decode($value); 
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
        $decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, Encryption_helper::encrypt_key(), $crypttext, MCRYPT_MODE_ECB, $iv);
        return trim($decrypttext);
    }

}